Nathaniel Herz was a metallurgist and served in the US military during the First and Second World Wars. Born in New Haven, Connecticut in 1889, Herz attended the Sheffield Scientific School at Yale University, graduating with a bachelor's degree in 1908 and a graduate degree in mining engineering in 1911. As a result of his decision to not pursue teaching, he began his career at Homestake Mining Company as an assistant chemist in its assay office and eventually became its chief metallurgist before retiring after forty-three years. After the United States entered World War I, he was drafted into the army and was soon transferred to the US Chemical Warfare Service, which is now known as the Chemical Corps, in Washington, DC. During World War II, he scouted deposits of uranium and vanadium in the United States as a result of his security clearance from what later became the Atomic Energy Commission. In this donated interview, Herz begins with recollections of his time at Yale and goes on to discuss his career at Homestake; the long-term changes in chemical processes at Homestake; his travels for his thesis research; his activities during World War I; and his involvement in community service and various men's clubs.